3. A missing Color
One color is
missing
Is input signalNoCheck video signal
normal?cable or video card.
0.7Vpp
Yes
Is the
output of pre-amp
NoTrouble in IC802 or its
(IC802, M52742ASP)
ambient circuit.
pin 29, 32, 35 all
normal?
Yes
Is CRTIs videoTrouble in
NoNo
Cathode (Rk, Gk, Bk)output IC803 waveform
video output
normal?Rk, Gk, Bknormal?circuit, IC803
About 45Vppor ambient.
YesYes
Each grid (G1, G2)Trouble in 80Vdc
voltage normal?line.
Yes
No
Trouble in G1 line
Replace CRTand G2 line
18 |